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Template engine for PHP

Smarty is a template engine for PHP. More specifically, it
facilitates a manageable way to separate application logic and content
from its presentation.

This is best described in a situation where the
application programmer and the template designer play different roles,
or in most cases are not the same person. For example, let's say you
are creating a web page that is displaying a newspaper article. The
article headline, tagline, author and body are content elements, they
contain no information about how they will be presented. They are
passed into Smarty by the application, then the template designer
edits the templates and uses a combination of HTML tags and template
tags to format the presentation of these elements (HTML tables,
background colors, font sizes, style sheets, etc.) One day the
programmer needs to change the way the article content is retrieved (a
change in application logic.) This change does not affect the template
designer, the content will still arrive in the template exactly the
same. Likewise, if the template designer wants to completely redesign
the templates, this requires no changes to the application
logic. Therefore, the programmer can make changes to the application
logic without the need to restructure templates, and the template
designer can make changes to templates without breaking application
logic.